Shoe machinery



Sept. 25, 1945. c.. LOGEMANN SHOE MACHINERY Original File d Feb. 15,1943 Reissued Sept. 25, 1945 SHOE MACHINERY Clarence L. Logemann,Milwaukee, Wis.

Original No. 2,327,806, dated August 24, 1943, Se-

rial No. 475,889, February 1 5, 1943. Application for reissue May 11,1945, Serial No. 594,802

16 Claims.

The present invention relates in general to improvements in the art ofshoe manufacture, and relates more specifically to improvements in theconstruction and operation of shoe making machinery, and especiallyequipment for dressing and finishing shoe heels after they have beenattached to the soles and uppers.

An object of the invention is to provide an improved heel dressingassemblage which is simple in construction and highly eflicient in use.

In the shoe manufacturing industry, it has long been customary to dressor scour the upper outer portion of the shoe heels, with the aid ofsanding wheels against which these heel portions are pressed by anoperator after the uppers have been applied to the soles and heels. Thesanding wheels used for this scouring operation are rotatable atrelatively high speed and are protected by a guard casing extendingpartially thereover, and unless the operator exercises extreme care andpatience, the edges of the sanding wheels frequently come in contactwith the outwardly extending uppers formed of leather or othermaterials, adjacent to the top of the heels, thus scufling or otherwisedamaging these uppers. In order to avoid such injury to the uppers, theoperators were heretofore obligated to work rather slowly and carefully,thus losing considerable time, and while this annoyance has existed formany years, no satisfactory solution of the problem has heretofore beenfound.

It is therefore a more specific object of my present invention toprovide improved mechanism of simple and durable construction, whichwill permit such heel scouring or dressing operations to be carried onmore rapidly and without danger of damaging the shoe uppers, and willalso produce more uniform heel seats and will thus add to the quality ofthe shoes.

Another specific object of this invention is to provide an improvedabrasive wheel guard assemblage which is more flexible in itsadaptations, and which is moreover cooperab-le with standard sandingwheel and guard casing assemblages of different sizes.

Still another specific object of the invention is to provide a new anduseful device for sanding the external curved surfaces of the shoeheels, which will automatically and positively prevent the abrasivesurfaces from contacting the uppers of the shoes to which the heels areapplied, and which will moreover simplify the heel scouring operationconsiderably.

An additional specific object of the present invention is to provide aconveniently applicable and readily adjustable guard attachment for shoeheel dressing machines, which is applicable as a unit to standard heeldressing wheel assemblages, and which may be manufactured at moderatecost.

A further specific object of my invention is to provide an improvedsafety device for shoe heel dressing wheels, which will materiallyenhance the production of shoes with utmost safety and at minimum cost.

These and other specific objects and advantages of my invention will beapparent from the following detailed description.

A clear conception of the several features constituting my presentimprovement, and of the mode of constructing and of utilizing abrasivewheel safety guards embodying the invention, may be had by referring tothe drawing accom-' panying and forming a part of this specificationwherein like reference characters designate the same or similar parts inthe various views.

Figure 1 is a front and side perspective View of one of my improvedabrasive wheel guard assemblages showing a fragment of the main guardcasing, and also showing a fragment of a shoe heel co-acting with afragment of an abrasive wheel in dot-and-dash-lines;

Figure 2 is a top view of the assemblage of Figure 1, showing theimproved device suspended from a fragment of the main guard casing whichis shown in section, and also showing the abrasive wheel in dot-and-dashlines;

Figure 3 is a side view of the same assemblage, showing the limits ofangular adjustment of the two guard plates which cooperate with theopposite sides of the wheel, in solid and dotand-dash lines; and

Figure 4 is a section through the improved guard assembly taken alongthe line 4-4 and looking rearwardly.

While the invention has been shown and described herein as beingespecially adapted for application to the heel scouring wheels of shoemaking machinery, it is not my desire or intent to unnecessarilyrestrict the scope or utility of the improvement, features of which mayobviously be advantageously applied to other types of sanding andabrasive equipment.

Referring to the drawing, the improved heel scouring assemblage showntherein comprises in general a pair of approximately parallel guardplates 6 and 1 adapted for disposition on opposite sides of the lowerfront portion of a sanding wheel 8, and being rigidly attached to thefront ends of suspension rods 9 and I0, respectively; a pair oflaterally spaced blocks I I having tion of the bracket I to the rearportion of 1 the main guard casing 29 of the sanding wheel 9; and aswing limiting element or plate 2| vertically adjustably secured to thebracket I5 by means of a cap screw 22 coacting with a slot 23 in theplate, and having a lower side notch 2:1 within which the rear end ofthe longer suspension rod 9 is normally loosely disposed and floatable.

The front and lower edge portons of the guard plates 6 and I arepreferably arcuately curved and chamfered as shown so that these plateswill present relatively thin curved edges extending along and normallydisposed outwardly beyond the adjacent curved edges of the wheel 8, andthe plates 6 and I should also be cut back to prevent drag on the wheeland may be rigidly attached to their respective rods 9 and III by screws26 or otherwise, as .shown in Figures 1, 2 and 3. The suspension rod IIIis somewhat shorter than the rod 9 since the latter engages the notch24, but these rods 9 and II] are normally maintained parallel toeachother by means of set screws coacting directly therewith at theopenings I4, and other set screws 28 coacting with the pivot shaft I3at-the openings I2 Uponrelease of the set screws 21, the rods 9 and I0may be adjusted forwardly and rearwardly within the openings I4 andrelative to the blocks II, and upon release of the set screws 28, theblocks I I may obviously be adjusted along and about the axis of thepivot shaft I3, but

normally all of the set screws 21 and 29 should be driven home. Thecollars II are also adjustably secured to the shaft I3 by means ofsimilar set screws 27' as shown in Figure 2, but when these collars havebeen properly positioned so as to permit oscillation of the shaft I3without permitting undesirable longitudinal shifting thereof, theyshould not be released except for dismantling of the assemblage.

The U'-shaped frame or bracket I5 from which the guard plates 6 and Iblocks II, and shaft I3 are swingably suspended, should be of relativelystrong and rigid construction, and the mounting stud I8 is preferablydisposed centrally of the bracket I5 and provides a swivel support aboutwhich the bracket may be angularly adjusted by merely releasing thefront clamping nut I9. The, plate H which limits the swinging motion ofthe guard plates 6V and I besides being vertically adjustable along theclamping cap screw 22, may also be adjusted angularly about the axis ofthis screw, and the slot 23 should be of sufficient width to normallypermit slight free swingingmovement ofv the guard plates 6 and Iinvertical planes toward and away from the central axis of the abrasivewheel 8. This free swinging motion is important in order to permit theshoe heels 29 to, be rolled in peripheral contact with the wheel 8 whichis rotatable at high speed about the axis of its supporting shaft in awell known manner.v

During normal use of the improved apparatus,

the guard assemblage should first be properly mounted upon the mainwheel guard 20 with the aid of the stud I8 and nuts I9, with the guardplates 6 and I on opposite sides of the wheel 8. The guard plate 1should then be adjusted with the aid of the set screws 21 and 28 and bymanipulation of the cap screw 22, so as to roperly position the edgeportions 29 of the guard plates with respect to the peripheral edges ofthe abrasive Wheel 9, substantially as shown in Figures 2 and 3. Thefree rotation of the wheel 3 should not be interfered with and the wheel8 should not contact the guard plates 6 and 1 and these plates should befree to swing slightly in vertical planes by virtue of the formation ofthe slot 2a in the plate 2|. The position of the plates 5 and I mayobviously be thus adjusted so as to cooperate with abrasive wheels 8 ofvariout widths and of various diameters disposed at different distancesfrom the pivot shaft I-3, and the slight swinging of the guard plates 6and I in vertical planes will be simultaneous.

When such proper mounting and adjustment of the assemblage has beenefi'ected, the operator may bring the heels 29 of the successive shoesin engagement with the periphery of the abrasive wheel 8 and may rollthe heel so as to finish the outer surface thereof as indicated inFigure l, and during such finishing or scoring of the heels 29, the edgeportions 25 of the guard plates 6 and I will coact with the recesses inthe shoes between the heel portion of the sole and the upper. Thiscoaction will prevent the uppers of the shoes from being'brought intocontact with the abrasive surface of the Wheel 8, and the reason forproviding two guard plates 6 and I, one on each side of the wheel 8, isthat the operator usually finishes oneside of each heel 29 adjacent toone peripheral edge of the wheel 8, and then reverses the shoe so as tofinish the other side of the heel adjacent to the other peripheral edgeof the Wheel 8. The slight rocking motion permitted by the limit stop 24will permit the operator to press the heels 29 into snug engagement withthe abrasive surface of the wheel 8, during the rolling of the heelduring the scouring operations, and without the flexibility afiorded bythis vertical swinging movement, it may be impossible for the operatorto thus effect contact between the wheel andheel and to avoi-d'thegrinding of local irregularities into the heel. It will thus be notedthat the assemblage is extremely flexible in its adaptations, andenables the operator to quickly scour the successive heels withoutdanger of having the abrasive wheel damage the uppers of the shoes withwhich the heels 29 are associated.

From the foregoing detailed description it will be apparent that mypresent invention provides an improved abrasive wheel guard assemblagewhich is simple and durable in construction and which is moreover highlyefiicient in operation. The various adjustments provided in theassemblage will permit the use thereof in conjunction with wheels ofdifferent sizes and having, the main guards disposed different distancesfrom the axis of rotation thereof, and the assemblage can obviously bereadily constructed of relatively stock material and may be quicklyassembled and dismantled. The improved device may obviously be appliedto existing scouring machines and may be manufactured, at moderate,cost. The invention has gone into highly successful commercial use andhas greatly enhanced the speed at which the heels can be scoured whilepositively preventing damaging of the-shoe uppers such as has heretoforefrequently occurred. In actual practice, the present improvement hasactually simplified the heel scouringoperation by at least 35 to 45 percent, and has resulted in the produc-.

tlon of heel seats which are far superior to those resulting from theprior methods whereby the application of the work to the wheels wasunrestrained by guard plates such as shown and described herein.

The limited movement of the guard plates 6 and I toward and away fromthe grinding wheel 8 aids an operator to properly position the heelsrelative'to the grinding wheel before the heels reach the grinding wheeland the operator-pushes the shoe against the weight of the guard plates6 and I.

Where an operator becomes skillful with my guard plates 6 and 1, he maydesire to set the guard plates an exact distance relative to thegrinding wheel. This eliminates the necessity of the initial upwardthrust of the guard plates. The exact setting and holding of the guardplates can be accomplished by moving the limiting plate 2| down untilthe upper wall of the notch 24 contacts the rod 9. Continued adjustmentof the limiting plate 2| is made until the guard plates 6 and I areraised to the exact required distance relative to the grinding wheel,after which the limiting plate 2| is swung on its cap screw 22 tightagainst the rod 9 to bind against and hold the rod 9. The plate 2| isheld against further movement by the tight adjustment of the cap screw22.

It shouldbe understood that it is not desired to limit this invention tothe exact details of construction or to the precise mode of use, hereinshown and described, for various modifications within the scope of theclaims may occur to persons skilled in the art.

I claim:

1. In combination with an abrasive wheel rotatable about an axis, aguard plate disposed adjacent to a side of the wheel and having anarcuate edge projecting outwardly beyond the adjacent peripheral edge ofthe wheel, and mounting means for said plate formed to produce limitedfree swinging thereof toward and away from the wheel axis by workpressed against the abrasive wheel surface.

2. In combination with a wheel having an abrasive peripheral surface andbeing rotatable about a fixed axis, a guard plate disposed perpendicularto said axis adjacent to a side of the wheel and having an arcuate edgeprojecting outwardly slightly beyond the adjacent peripheral edge of thewheel and mounting means for said plate formed to produce limited freeswinging thereof about an axis disposed parallel to the wheel axistoward and away from the latter by work pressed against said abrasivewheel surface.

3. In combination with an abrasive wheel rotatable about an axis, aguard plate disposed adjacent to a side of the wheel and having anarcuate edge projecting outwardly beyond the adjacent peripheral edge ofthe wheel, mounting means for said plate formed to produce limited freeswinging thereof toward and away from the wheel axis by work pressedagainst the abrasive wheel surface, and means for effecting fixedadjustment of said plate both toward and away from the adjacent side ofthe wheel and toward and away from the wheel axis.

4. In combination with a wheel having an abrasive peripheral surface andbeing rotatable about a fixed axis, a guard plate disposed perpendicularto said axis adjacent to a side of the wheel and having -an arcuate.edge projecting outwardly slightly beyond the adjacent peripheral edgeof the wheel, mounting means for said plate formed to produce limitedfree swinging thereof about an axis disposed parallel to the wheel axistoward and away from the latter by work pressed against said abrasivewheel surface, and means for effectmg fixed adjustment of said plateboth along the wheel axis and in a direction perpendicular thereto.

5. Incomblnation with an abrasive wheel rotatable about an axis, a guardplate disposed on each of the opposite sides of the wheel and eachhaving an arcuate edge projecting outwardly slightly beyond the adjacentperipheral wheel edge, and common supporting means for said platesformed to produce limited simultaneous freemovement thereof toward andaway" from the wheel periphery by work applied to the wheel.

6. In combination with a wheel having an abrasive peripheral surface andbeing rotatable about a fixed axis, a guard plate disposed on each ofthe opposite sides of the wheel, said guard plates lying in parallelplanes perpendicular to the wheel axis and each having an arcuate edgeprojecting outwardly slightly beyond the adjacent peripheral wheel edge,and common supporting means for said plate formed to producesimultaneous free swinging thereof about an axis disposed parallel, toand remote from the wheel axis toward and away from the latter by workapplied to the wheel Periphery.

7. In combination with an abrasive wheel rotatable about an axis, aguard plate disposed on eachof the opposite sides of the wheel and eachhaving an arcuate edge projecting outwardly slightly beyond the adjacentperipheral wheel edge, common supporting means for said plates formed toproduce limited simultaneous free movement thereof toward and away fromthe wheel periphery by work applied to the wheel, and means foreffecting independent adjustment of said plates either toward said wheelor its axis.

In combination with a wheel having an abrasive peripheral surface andbeing rotatable about a fixed axis, a guard plate disposed on each ofthe opposite sides of the wheel, said guard plates lying in parallelplanes perpendicular to the wheel axis and each having an arcuate edgeprojecting outwardly slightly beyond the adjacent peripheral wheel edge,common supporting means for said plate formed to produce simultaneousfree swinging thereof about an axis disposed parallel to and remote fromthe wheel axis toward and away from the latter by work applied to thewheel periphery, and means for effecting independent adjustment of eachof said plates both along the wheel axis and perpendicular thereto.

9. In combination with an abrasive wheel rotatable about a horizontalaxis, a bracket mounted rearwardly of said wheel, a pivot shaft carriedby said bracket approximately parallel to the wheel axis, an arcuateguard suspended from said shaft and being disposed closely adjacent to aside of said wheel but projecting slightly beyond the adjacent wheeledge, and means carried by said bracket for producing limited freeswinging of said guard relative to the wheel axis by work applied to thewheel periphery.

10. In combination with an abrasive wheel rotatable about a fixedhorizontal axis, a bracket disposed rearwardly of said wheel, a pivotshaft carried by said bracket parallel to the wheel axis,

each side of the wheel.v and each projecting slightly beyond theadjacent wheeledge, and-al limit stop carried by .said bracket andcoacting with only one of said guards for permitting limitedsimultaneous free swingingofbothguards;

11. In combination with an abrasive wheel ro.

tatable about a fixed horizontal axis, Labracket disposed rearwardly ofsaid wheel, a pivot shaft carried by said bracket parallel to the wheel.axis, 'an'arcuate guard suspended from said shafton each side of thewheel and each projecting slightly beyond the adjacent wheel edge, and astop for limiting the movement of said guards relative to said wheel byworkcoacting with the latter. Q a 12. In combination with an abrasivewheel'ro tatable abouta fixed horizontal axis, a bracket disposedrearwardly of said wheel, a pivot shaft carried by said bracket parallelto the, wheel axis, an arcuate guard suspended from said shaft on eachside ,of the wheel and each projecting slightly beyond the adjacentwheeledge, andan adjustable stop carried by said bracket and. coacting withsaid guards to limit the movement of the latter relative to saidwheel bywork. pressed against the wheel periphery.

13. In combination with an abrasive wheel rotatable about a fixedhorizontal axis, a bracket disposed rearwardlyof said wheel, a pivotshaft carried by said bracketparallel to the wheel axis,

an arcuate guide suspended from said shaft and arranged adjacent to aside of the wheel and pro: jecting slightly beyond the adjacentwheeledge, and means for holding the guide an exact desired distancerelative tothe wheel edge.

. .14. In combination withan abrasive wheel rotatable about a fixedhorizontal axis, a bracket an arcuate guard suspended from saidshaitondisposed rearwardly ofsaid wheel, a pivot shaft carried by said bracketparallel to the wheel axis, an arcuate guide suspended from said shaftand disposed adjacent to a side of the wheel and projecting slightlybeyond the adjacent wheel edge, and a stop for limiting; the movement ofsaid guide relative to said wheel by work coacting with the latter whenthe stop is in one position and for holding the guide in a set positionrelative to the wheel when the stop is in another position.

15. In combinationwith an abrasive wheel rotatable; about an axis, aguard plate disposed adjacent to a side of the wheel and having anarcuate edge projecting outwardly beyond the adjacent peripheral edge ofthe wheel, mounting means for said plate formed to produce limited freeswinging movement thereof toward and away from the wheel axis by workpressed against the abrasive wheelsurface, and means for holding theplate in a desired set position relative to the wheel against swingingmovement.

16. In combination with an abrasive wheel rotatable about a horizontalaxis, a bracket mounted rearwardly of said wheel, a pivot shaft carriedby said bracket approximately parallel to the wheel axis, blocks securedto said pivot shaft for movement therewith, rods carried by said

